Selection of Single Screw Pump

The G-type single screw pump belongs to the rotary displacement pump, which relies on the mutual engagement of the screw and the liner to produce volume changes in the suction and discharge chambers to transport liquids. It is a closed screw pump with internal meshing, and the main working components consist of a liner (stator) with a double headed spiral cavity and a single headed spiral screw (rotor) that meshes with it inside the stator cavity. When the input shaft drives the rotor to rotate around the center of the stator through the universal joint, the stator rotor pair continuously meshes to form a sealed chamber. These sealed chambers move at a constant speed in the axial direction, conveying the medium from the suction end to the discharge end through the stator rotor pair. The medium sucked into the sealed chamber flows through the stator without being stirred or damaged.

Selection of Single Screw PumpSingle screw pumps have many advantages compared to piston pumps, centrifugal pumps, vane pumps, and gear pumps due to their structure and working characteristics

1. Capable of transporting media with high solid content;

2. Uniform flow and stable pressure, especially at low speeds;

3. The flow rate is directly proportional to the pump speed, thus having good variable adjustability;

4. A pump with multiple uses can transport media of different viscosities;

5. The installation position of the pump can be tilted arbitrarily;

6. Suitable for transporting sensitive items and items that are susceptible to damage such as centrifugal force;

7. Small size, light weight, low noise, simple structure, and easy maintenance.

Selection of Single Screw Pump

The specifications of the pump are determined based on the properties, flow rate, and pressure of the liquid being transported, while the pump speed is mainly selected by the viscosity and corrosiveness of the liquid being transported as the main parameters to ensure reliable operation of the pump.

The design speed of the pump is allowed to be as high as possible when transporting clean water or non corrosive liquids similar to clean water. In practical use, due to different medium properties and service life requirements, the selected speed should generally be lower than the design speed. For high viscosity and granular media, generally 1/2-1/3 or lower of the design speed is used. Low speed is beneficial for pump wear, but after use, due to stator wear, the flow rate decreases. In this case, it is advisable to increase the speed appropriately to compensate for the decrease in flow rate.